RELATED VIDEO: Inside Carrie Underwood’s New Life with a Family of 4: ‘They’re Total Homebodies’

“They’re total homebodies,” a source previously told PEOPLE. “They rarely leave their home at night and love the outdoors and often go for walks… Carries lives a very quiet life. They take Isaiah fishing, to the zoo and to farms so he can learn about animals. They very much live a farm life and seem to love it.”

“Jacob Bryan Fisher entered the world in the wee hours of the morning on Monday … his mom, dad and big brother couldn’t be happier for God to trust them with taking care of this little miracle!” Underwood wrote alongside a photo gallery of herself, Fisher and Isaiah and the newborn.

“Our hearts are full, our eyes are tired and our lives are forever changed. Life is good … ” she added.

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